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Chalcedony's standard chemical structure (based on the chemical structure of quartz) is SiO 2 (silicon dioxide). Chalcedony has a waxy luster, and may be semitransparent or translucent. It can assume a wide range of colors, but those most commonly seen are white to gray, grayish-blue or a shade of brown ranging from pale to nearly black.
The carnelian is a siliceous stone and a species of chalcedony. Its colour is a flesh-hued red, varying from the palest flesh-colour to a deep blood-red. It is of a conchoidal structure. Normally its colour is without clouds or veins; but sometimes delicate veins of extremely light red or white are found arranged much like the rings of an agate.
Main jade producing countries. Jade is an umbrella term for two different types of decorative rocks used for jewelry or ornaments.Jade is often referred to by either of two different silicate mineral names: nephrite (a silicate of calcium and magnesium in the amphibole group of minerals), or jadeite (a silicate of sodium and aluminum in the pyroxene group of minerals). [1]
Jadeite is the principal mineral making up the most valuable form of jade, a precious stone particularly prized in China. Most gem-quality jadeite jade comes from northern Myanmar. Jade tools and implements have been found at Stone Age sites, showing that the mineral has been prized by humans since before the beginning of written history.
Jade Jade is most commonly associated with the colour green but can come in several other colours as well. Jade is closely linked to Asian culture, history, and tradition, and is sometimes referred to as the stone of heaven. Jasper Jasper is a gemstone of the chalcedony family that comes in a variety of colours.
Langgan (Chinese: 琅玕) is the ancient Chinese name of a gemstone which remains an enigma in the history of mineralogy; it has been identified, variously, as blue-green malachite, blue coral, white coral, whitish chalcedony, red spinel, and red jade.
A meteorologist from Seattle, Washington, who is nearly eight months pregnant, has a message for viewers who feel the need to comment on her clothing choices.
Jade bird pendant from Costa Rica. Jadeite is presumed one of the most precious materials of Pre-Columbian Costa Rica. It, along with other similar-looking greenstones (e.g. chalcedony, serpentine, and green jasper) were cherished and worked for years. Jadeite was used to decorate the body and was presumably a symbol of power.
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